# 棋盘尺寸
BOARD_SIZE = 7

# 棋盘初始化
board = [[' ' for _ in range(BOARD_SIZE)] for _ in range(BOARD_SIZE)]
board[0] = ['@', '-', '-', '@', '-', '-', '@']
board[1] = ['|', '@', '-', '@', '-', '@', '|']
board[2] = ['|', '|', '@', '@', '@', '|', '|']
board[3] = ['@', '@', '@', ' ', '@', '@', '@']
board[4] = ['|', '|', '@', '@', '@', '|', '|']
board[5] = ['|', '@', '-', '@', '-', '@', '|']
board[6] = ['@', '-', '-', '@', '-', '-', '@']

# 输出当前棋盘状态
def print_board():
    print('  ' + ' '.join([chr(ord('A') + i) for i in range(BOARD_SIZE)]))
    for i in range(BOARD_SIZE):
        print(str(i + 1) + ' ' + ' '.join(board[i]))

# 落子
def place_piece(row, col, piece):
    if row < 0 or row >= BOARD_SIZE or col < 0 or col >= BOARD_SIZE:
        return False
    if board[row][col] != '@':
        return False
    board[row][col] = piece
    return True

# 移动棋子
def move_piece(src_row, src_col, dst_row, dst_col):
    if src_row < 0 or src_row >= BOARD_SIZE or src_col < 0 or src_col >= BOARD_SIZE:
        return False
    if dst_row < 0 or dst_row >= BOARD_SIZE or dst_col < 0 or dst_col >= BOARD_SIZE:
        return False
    if board[src_row][src_col] == '@' or board[dst_row][dst_col] != ' ':
        return False
    board[dst_row][dst_col] = board[src_row][src_col]
    board[src_row][src_col] = '@'
    return True

# 吃子
def capture_piece(row, col):
    if row < 0 or row >= BOARD_SIZE or col < 0 or col >= BOARD_SIZE:
        return False
    if board[row][col] == ' ':
        return False
    board[row][col] = '@'
    return True

# 游戏主循环
def game_loop():
    print_board()

    while True:
        # TODO: 根据游戏规则获取下一步操作
        # 这里暂时通过用户输入示例进行模拟
        try:
            command = input('请输入您的指令（例如：落子：place 3 D，移动棋子：move 3 D 4 E，吃子：capture 4 E）：')
            command_parts = command.split()
            if len(command_parts) < 2:
                raise ValueError('无效的指令')

            action = command_parts[0]
            if action == 'place':
                if len(command_parts) != 3:
                    raise ValueError('无效的落子指令')
                row = int(command_parts[1]) - 1
                col = ord(command_parts[2].upper()) - ord('A')
                if not place_piece(row, col, 'X'):
                    raise ValueError('落子失败')
            elif action == 'move':
                if len(command_parts) != 5:
                    raise ValueError('无效的移动棋子指令')
                src_row = int(command_parts[1]) - 1
                src_col = ord(command_parts[2].upper()) - ord('A')
                dst_row = int(command_parts[3]) - 1
                dst_col = ord(command_parts[4].upper()) - ord('A')
                if not move_piece(src_row, src_col, dst_row, dst_col):
                    raise ValueError('移动棋子失败')
            elif action == 'capture':
                if len(command_parts) != 3:
                    raise ValueError('无效的吃子指令')
                row = int(command_parts[1]) - 1
                col = ord(command_parts[2].upper()) - ord('A')
                if not capture_piece(row, col):
                    print('吃子失败')
                    continue
            else:
                print('无效的指令')
                continue

            print_board()
            # TODO: 判断游戏是否结束，输出胜负结果并结束循环

        except ValueError as e:
            print(str(e))
            continue

# 启动游戏
game_loop()
